Going for bigger or smaller?

So I supppse this question is more of an Aneros product or product design question. I know there are people working for the company hanging around so I hope they will chime in. But if you don’t work for the company but has the answer or information, by all means please share. 

I’ve had a Helix Trident and a MGX syn so far, and I like the latter better. Now when I’m exploring to have my third Aneros, I look at the Aneros website. There are two models that stand out to me. One is the Eupho and the other is the Progasm Jr. So size wise, one is smaller than what I have the other is bigger. What I find interesting is that the “smaller” Eupho is presented as for “advanced users”. Well naturally I thought now that I’d have some experience, I’d like to take the challenge and try one designed for the “experienced users”. Then I also know people seem to tend to go for bigger sized things when they have more experience. So experts out there, which one should I go for? Forget about “personal preferences” for a moment. What I really want to know I guess is what the Eupho designed to be used and enjoyed for experienced users who might’ve used other Aneros products. Thanks.